The Seven Demon Beasts were created by Rengokuki also known as the Zero-Tails, though the use of the "Synthesis of Yin-Yang" "(統合陰陽, Tōgō Onmyō)". Upon years of gathering enough dark chakra. The return and defeat of the Jubi and obtaining its current form. It began its plan to consume the world in eternal darkness, to do this, using a method smiler to the creation of the tailed beast, it split portions of its Dark Chakra into seven spheres. He then sealed the crystals into seven captured ninja, then tortured them allowing their hate, anger and fears to flow into the crystal along with it consuming the host's chakra. After several years of doing this, the crystals grew to the size of the Shukaku. Knowing that his creations were finally complete, he infused his dark chakra into the crystals